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The plural of penis is 'penii.'' Is this claim true?

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No, (pace Lee Ballentine and Quora User) it is not true, for two reasons: (1) In English, not all Latin-derived words retain their original Latinate plural endings. read more

(2) Even in Latin, the plural of penis is not penii, but penes. In Latin, the word originally meant 'tail', and like almost all third declension nouns, the -is suffix in the nominative singular becomes the an -es suffix in the nominative plural. read more

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